From ff19463e25690c8385544fd74b938f99260f17b4 Mon Sep 17 00:00:00 2001
From: Jaime Bernardo <jaime@janeasystems.com>
Date: Wed, 21 Feb 2018 20:04:09 +0000
Subject: [PATCH] android: use gradle tasks inputs and output

Defines the native modules tasks inputs and outputs so that native
modules are only rebuilt if the nodejs-project has changed. Also
avoids rebuilding the NDK standalone toolchain if it's already
there.
---
 src/android/build.gradle | 43 +++++++++++++++++++++++++++-------------
 1 file changed, 29 insertions(+), 14 deletions(-)

diff --git a/src/android/build.gradle b/src/android/build.gradle
index 1026e76..2b17acd 100644
--- a/src/android/build.gradle
+++ b/src/android/build.gradle
@@ -64,10 +64,6 @@ if (shouldRebuildNativeModules==null) {
 
 if ("1".equals(shouldRebuildNativeModules)) {
 
-    task CleanNPMTempBuildDir (type: Delete) {
-        delete "${rootProject.buildDir}/nodejs-native-assets-temp-build/"
-    }
-
     android.defaultConfig.ndk.abiFilters.each { abi_name ->
         String temp_arch = {
             switch (abi_name) {
@@ -137,22 +133,39 @@ if ("1".equals(shouldRebuildNativeModules)) {
             throw new GradleException("Unsupported opperating system for nodejs-mobile native builds: ${OperatingSystem.current().getName()}")
         }
 
-        task "CopyNodeProjectAssets${abi_name}" (type:Copy) {
-            dependsOn "CleanNPMTempBuildDir"
+        task "CopyNodeProjectAssets${abi_name}" {
             description = "Copying node assets to build native modules for ${abi_name}."
-            from "${project.projectDir}/assets/www/nodejs-project/"
-            into "${rootProject.buildDir}/nodejs-native-assets-temp-build/nodejs-native-assets-${abi_name}/nodejs-project/"
+            inputs.files fileTree (
+                    dir: "${project.projectDir}/assets/www/nodejs-project/"
+                ).exclude({
+                    details -> // We shouldn't need to rebuild native code if there are only changes in the Node.js project javascript files.
+                        !details.isDirectory() &&
+                        details.getPath().endsWith('.js') &&
+                        !details.getPath().startsWith('node_modules/')
+                })
+            outputs.file "${rootProject.buildDir}/nodejs-native-assets-temp-build/nodejs-native-assets-${abi_name}/copy.timestamp"
+            doLast {
+                delete "${rootProject.buildDir}/nodejs-native-assets-temp-build/nodejs-native-assets-${abi_name}/"
+                copy {
+                    from "${project.projectDir}/assets/www/nodejs-project/"
+                    into "${rootProject.buildDir}/nodejs-native-assets-temp-build/nodejs-native-assets-${abi_name}/nodejs-project/"
+                }
+                new File("${rootProject.buildDir}/nodejs-native-assets-temp-build/nodejs-native-assets-${abi_name}/copy.timestamp").text = "${new Date().format('yyyy-MM-dd HH:mm:ss')}"
+            }
         }
 
         task "MakeToolchain${abi_name}" (type:Exec) {
-            dependsOn "CopyNodeProjectAssets${abi_name}"
             description = "Building a native toolchain to compile nodejs-mobile native modules for ${abi_name}."
             executable = "${ndk_bundle_path}/build/tools/make-standalone-toolchain.sh"
             args "--toolchain=${temp_toolchain_name}-${temp_cc_ver}", "--arch=${temp_arch}", "--install-dir=${standalone_toolchain}", "--stl=libc++", "--force", "--platform=android-22"
+            outputs.file "${standalone_toolchain}"
         }
 
         task "BuildNpmModules${abi_name}" (type:Exec) {
             dependsOn "MakeToolchain${abi_name}"
+            dependsOn "CopyNodeProjectAssets${abi_name}"
+            inputs.file "${rootProject.buildDir}/nodejs-native-assets-temp-build/nodejs-native-assets-${abi_name}/copy.timestamp"
+            outputs.file "${rootProject.buildDir}/nodejs-native-assets-temp-build/nodejs-native-assets-${abi_name}/nodejs-project/"
             description = "Building native modules for ${abi_name}."
             workingDir "${rootProject.buildDir}/nodejs-native-assets-temp-build/nodejs-native-assets-${abi_name}/nodejs-project/"
             commandLine 'npm', '--verbose', 'rebuild', '--build-from-source'
@@ -170,12 +183,9 @@ if ("1".equals(shouldRebuildNativeModules)) {
             environment ('LINK',"${npm_toolchain_link}")
             environment ('GYP_DEFINES',"${npm_gyp_defines}")
         }
-        task "CleanFinalNpmAssets${abi_name}" (type: Delete) {
-            delete "${rootProject.buildDir}/nodejs-native-assets/nodejs-native-assets-${abi_name}/"
-        }
-        task "CopyBuiltNpmAssets${abi_name}" (type:Copy) {
+
+        task "CopyBuiltNpmAssets${abi_name}" (type:Sync) {
             dependsOn "BuildNpmModules${abi_name}"
-            dependsOn "CleanFinalNpmAssets${abi_name}"
             description = "Copying node assets with build native modules for ${abi_name}."
             from "${rootProject.buildDir}/nodejs-native-assets-temp-build/nodejs-native-assets-${abi_name}/nodejs-project/"
             into "${rootProject.buildDir}/nodejs-native-assets/nodejs-native-assets-${abi_name}/"
@@ -186,7 +196,12 @@ if ("1".equals(shouldRebuildNativeModules)) {
         task "GenerateNodeNativeAssetsLists${abi_name}" {
             dependsOn "CopyBuiltNpmAssets${abi_name}"
             description "Generates a list for runtime copying"
+            inputs.file "${rootProject.buildDir}/nodejs-native-assets/nodejs-native-assets-${abi_name}/"
+            outputs.file "${rootProject.buildDir}/nodejs-native-assets/nodejs-native-assets-${abi_name}/file.list"
+            outputs.file "${rootProject.buildDir}/nodejs-native-assets/nodejs-native-assets-${abi_name}/dir.list"
             doLast{
+                delete "${rootProject.buildDir}/nodejs-native-assets/nodejs-native-assets-${abi_name}/file.list"
+                delete "${rootProject.buildDir}/nodejs-native-assets/nodejs-native-assets-${abi_name}/dir.list"
                 String file_list = "";
                 String dir_list = "";